Re: Getting values from another object

[Olivier Hamel <evilpineapple@...>]

Colm Sloan wrote:
> I have an unusual situation. I have an object in C++ that is given 
> many many values in C++. I can grab this object and get its Lua 
> equivalent:
> <code>
>
> I want to make it so I can create a Lua object that inherits all of 
> the values associated with that C++ object. I made it so I pass the 
> object to another class but it can't use the syntactical sugar of ":", 
> making it feel very unnatural:
>
> <code>
> I understand this is a complicated post so all input is appreciated.
I'm having difficulty understanding what you're trying to accomplish. I 
believe you're trying to create derived classes in Lua, using the C++ 
userdata object as a base class of sorts? If I'm understanding what 
you're trying to do, you're attempting to override some default 
functionality provided by the metatable of the C++ object with a Lua 
replacement. Specifically you're trying to override the method for 
'Setup' with your own function defined in Lua, and have the C++ 'base' 
Setup method call the correct 'derived' method according to the Lua 
class name.

Since you can store data in your C++ object's associated Lua table (I'm 
basing this assumption on 'self.luaClassName'), I'd suggest you merge 
your data defined in the Lua class's table directly into the associated 
table. If your __index metaevent handler prioritizes content in the 
associated table over content in the metatable, when you call 
'self:Setup()' it should invoke the Lua method that was stored in your 
associated table. This should then work for all merged methods/data members.

Olivier